Chicago Police are investigating several shootings after a violent weekend that left at least seven people dead and more than three dozen wounded.

The Chicago Sun-Times reported Monday that it was the city’s most violent weekend of the year.

Authorities say the weekend’s first homicide happened late Friday. The tally, which included at least 41 injuries, spanned Friday night through Sunday night.

Also, police say an officer shot and killed a teenager Sunday night on the South Side after the teen pointed a gun at them. The Cook County Medical Examiner’s office identified the teen as 15-year-old Michael Westley.